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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afa8664d7bf5050483118a5439b7ead4160eb1d1949b4ab89b8e30ba1ae0d36' 
  AND token = '2NyaVDHMwJn1IKsEOy2M3KZ7+8vV3G9DoZ/w0jNfXk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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