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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe8b2782912b186bc96e8d607f82114d084aecce38e088ac1b4acf8adee4330' 
  AND token = 'coa6D/04cGOXGq0QsDmXyDWQLQd4jBuEIAFwWNMLs9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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