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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc1ba24f9b57fea6ce71aed4f2bfd1b05e6a3586eaaf0c5613da14844694f86' 
  AND token = 'DmmCd3JeOC/X4y0Ucy178RdzqtR4vv5ViVgHDn5XDto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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