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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55c3280f8bec3e7a439411381e67b40547a63af1fc9ed5cde9b65f8b7c4ce4b' 
  AND token = '5rD+RtpXgpBqeC0M+WzvjaiRc26jdQfEtrkbF20tA8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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