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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c31cf31e09b4685e3b8f01290056cb2e01512f2f1f5349d48025bea81917ca' 
  AND token = 'wHUFWzs4HmP6B3LqL/U8NW7Lyu5TH50bkcgDFeMNCnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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