SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe7ce5edfdd513da307facd08a238a3d992a5bb07402d225e19fa1ca3d57161' 
  AND token = 'SBJ85GulMQjWV0QUvmwQYiHRZ4rufGdA9hThuqZ78yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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