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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e5cd077aedd907ab3593be0e245ff20f9213ae8353ec59490209a383d6f7ba' 
  AND token = 'dY7rFIZJB/K1nwtw3eNtos12BssLqAxV1PzIeTDWE1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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