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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea824ad72abcca3836f639434437e15cbd597bb554a210dd2e216c877fad702' 
  AND token = 'CkttaAtYpxpIKWRRKG860b1IC69O+MResaVlF2zVirY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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