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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c00ff9d093b4f37ad6e78644636f1cac30c9881db1b20de4da48af406f9d69' 
  AND token = 'GEifwXa596iLmD5P4ZpUr7nBfn6xjzDscu1Nynwtuz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}