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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36e350419396ba1eeef6258d752693a4a1191b87a1505b828f3ebfcd15096ba' 
  AND token = 'Gj7iWBa3E7u30AnpKX8xo008xJuiWRMTUUkaE89x5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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