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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced29fe86916f025b1ccb260097dcb794dacff8b8dbb0de48e37194e1d5e4038' 
  AND token = '36yz/rFfPlwjm7+voKNr1InmHPx1yW9ZKK6ku7ssP9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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