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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde984603e82e1e23cea24e51e6ee2fac7c5d33008c5465bab52c88161bbcd1c' 
  AND token = '4T8Giuxk3CUCGq4X09PAfFrIq6K4bxF9gmttmeaDy3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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