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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58813575fe0ba3a38e0b9f6dddeb698401a7ede79fd69d5bea2170449f368735' 
  AND token = 'pXUvJH+A9pN5jD53v3utnRE5BrTZY7l5O4Pt6QwKzZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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