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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e2ed56f630a7c8e848f68183b400772a2ad99add7ca9d800b3df0d49dd03ad' 
  AND token = 'JIT9zBtSEXz8jvASy/USj+m5sNi7k/f0tBAav4Hk738=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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