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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b52e99227cacfadcdd7fa2a470634a858e05c891e876df1b8ae5b9f35a434b' 
  AND token = '1QgWoYW3D2hWs1y8s8NEwYZM+VFrmi9AH7Bi7ygI3JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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