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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7c0f35edf51ea012f0a47bcef48267a35a7fc36167a830ea73506a34015ab5' 
  AND token = '5FZP/Ja+tF47IMJ/DJyqail3lMtKzcQZxXlwZl8MKsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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