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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5cd4fddf38d8378e665666e688186ac90e78d11ca560882d9e9f7c89f82e62' 
  AND token = 'FmdR0XHvgYwt/UXPs9aahwIvHBEV+/k48eP5K3BJqow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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