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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2a88e60c956094f7d6e51da7818f0da3721d9de7cac1f47ba8584e03322414' 
  AND token = '7bO5AtxiyuhT3/7h1dGfUfAimvs5XI60wIQ1Heb8ZmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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