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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6251ebca20b36bd902e1de402e4b98c04dfa5651aede52cac366db7e4cb62a' 
  AND token = 'mAsSbc9Dl4LFiZLL/FGANHNSkolBeT/IiJyqTIryo8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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