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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf0b71cf8fbaee239fee6d150e47d797338489f3c4d8b34b39bbfa079acc8bc' 
  AND token = 'M90qx1widBekPJncslWepGX8MbjT//pdk3PvOKyD+Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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