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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307f0af14b31c4cd6748926e91a5e46e223fb9b9db581733329af66810e5098c' 
  AND token = 'Nc78IFFkipgHAgAppxpuJjmoQoIqtBx+37h8RO9haok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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