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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae7313b82902feb302286a4cfab341d213a19c3e5a3cf1e8d1b388f3fe8b9a5' 
  AND token = 'lqiRfgN/Go4FSgnJIBOApda2+7KlcT1vr5m7LfPTWbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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