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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984ea9df2230938df75bc91f553485718ca617c447daa0056d7362668f36c956' 
  AND token = 'PyPiRlLmLH3wuBdPliZD4Fyr/PB5nUN/Sayo2BqfMV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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