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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ddd722a76ae837ad043e47bddee72256a4a838aa133d10a2c8ded99fb3c114' 
  AND token = 'NcDGuQfyrPA7z7K30/8ZIetBP5nGkP9iN1vZrwt8kac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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