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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e019e4d785272bcdee1ec117d8abca9d23756f7bbb9ec20e17b07a85a1d8daee' 
  AND token = 'ci9lBeKGmKBcZILIWyTCZ5Fuus4nEVCa5NU/z/WBll0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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