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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68687819f5672726f0d139faeee3fa9fda59fe0f7e16b5686a34ad013f6d4811' 
  AND token = '2qpIzyoxCmPKHtqrm71OaSnrTuoj0d6OWLABE4pdKjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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