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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b3b2896dca69f0652119834ab5b89c9d62204d927a15f7327ab13234a49903' 
  AND token = '9llijXdIzjzg/j7bTgeJ4piyGwiN9VpLasDXmtWgcwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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