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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7f35fa4dc4524666c9c77a1e88201056e9ee30f47f66ce419629c467a81736' 
  AND token = 'zVpQfdqnDJtb4C4NCic4xnbUKSuJsJCu3zljMNeEOnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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