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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d247f7b1141cd90ac53e786fcf360b51ab5f53db851551701d145e820af1bb' 
  AND token = 'bJoWC5/SIVxNb3qwVkxaqq8j50D0yQ77WX9lSFObYJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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