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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae122d879b91dc32d9117e350b3497341290e78b8717473ebd8dc480c3ee6f74' 
  AND token = 'a2f66NizRjqT1vEHP/YQMSc9N6P8xrD34sRToLNxtKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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