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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418c34fb6ced4b0ccb65bfe8bedcd9e52a905cc8062a1dea67be332c2c1f4732' 
  AND token = '81Wzx8AMYK4SxH7ZqEpWYr4oHs7QLLEba9Q9TzoDHwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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