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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741de58ff18e774c62df36cfd899b822355af0038b1455cc343afa700819379a' 
  AND token = 'Ukqs0z7yPBLXBiN0iwpd06n1Fb5rslWvFWclPfCx1VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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