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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4320f1f84905aac2912ac6984050bf08f8f26c2687855f4f97130c2d8c9788' 
  AND token = '/gBnX9Wo2oQH2AYXMW9KYb1KhGt4M4O5FlThtXxocrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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