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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cab50fed4071837543dea2ce79a3aeb5a2d5541d035c2d81f6e990fa1b77c8' 
  AND token = 'mzYo3fryLoJ5TJP2gzj+fTMSgYqmtud36DtnGU8lZ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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