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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3706803861b5f4d195b420cd9e5c4ebf8b60f865506400ffadc7a5767fc9cd' 
  AND token = '1Fm7gSjUt8D2jRhlgM69Pviezdt/W+wIrQc2WFvbm5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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