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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff65d4fbddb2ae15298569a5d89d3a19ac8c887eab7924a1baac851ae9381608' 
  AND token = 'cabO4qLc4T+2YhRCeFG09O9iIqMgokXi9gfh9FWeyQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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