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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17f58b2dabd905ba0544772e6e9b0f2d0216b379b62223536be5279ee73ce66' 
  AND token = '5KLC3mBwizyxyYjA92E9T0eAD4N7LwjfKZrv7cJ1YaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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