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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad3edcfbcf8b2306a177248caca33191463d596d6f988000d951cbae153ea6e' 
  AND token = 'lWiqDT09j/fLWh4q653Vw5nyZyq76Ggw5f+Tc3vJMZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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