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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745cdcc7902ff5ed2bef82eda1d08a12ecfcb4b29695b64b15a86f453ebac462' 
  AND token = 'Vy5u23hQrm7Ybi/DaRcEA6UpUN/K6ertYEtFaDlHW/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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