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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbea53a92490aed38bbc0bf4339615f6b6e4ca42fd24a688d1b82d6a0d3db9a' 
  AND token = 'uDVaPHb/appnK3Lu7IhTdQrpHgKGUBYpAHyra1bY7vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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