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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2982cc9056b66dd2707aa25a93c6fa3db002f34fa79299173c76c283f62fe1fc' 
  AND token = 'svpDzCmCl+dnSZot9eCjb1gy4lPmdq8p6C/IQ47NI8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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