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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8333b551973d90e1a70fcb317a8ce7449688c724c6152dfd45d7f7ebbee55b' 
  AND token = 'prgrUqnsIN4HlKgsB37g10ap5UWm8/Np5RREtOQudyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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