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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c78adf5d01d3a2f7d219c6d9823b667db2ee7a1d2def4a4b3d2cd30cf5f1ac' 
  AND token = 'p9qM0NJWkVKc13rZrQyFf32u1qZrqbrfwv99+flauQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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