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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3220090211dddb7778d35e0d19cbb86ae33458b162c233d94469e2d3da79ac' 
  AND token = 'RzbDu8+46kImJ1ITb5yjJmK74iFPczAG7f0UVqIgNkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00511

JSON explain

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