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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efe02cb098d14839d532f2bfe6b7870f45e78dd07d131f552f502a4d4875e2d' 
  AND token = 'WH/eYK7xpHd0ZT6SKi2p/6fH34JiLIkJ3kidFtRDwA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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