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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a476496112c02ba8488059274e2b8e4cdd0008c463f9dec279296317f3a5d33e' 
  AND token = 'TUUL1ou2oDXnoPXYbvMqoVHvv+e6SyAwh8VD+xJtCmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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