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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b033217ae916c30755e94efd70966c795797951af5ec7c89454d99d9a2ca2a5' 
  AND token = 'JD3oFt5HFUHl7iBd/D9eyP7QhFSemy2OkpkymYkj6l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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