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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ef41dae108cd9acc749d4b4ed075f385909fa3975ca8f8e74d1d1ad61e00db' 
  AND token = 'v2LqGHpM0wEaR4LyOMy8X7Ce2EJJruLwm5mRtg5iwPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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