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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03957db10e735ee3541a3b27f07ca98fdd4b409f653f3c3992d4b409ae8c7a90' 
  AND token = 'BrEh1S/mr/NnFoxTG+c2z70HEvT1FHOoR9yS5TCv8eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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