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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca70f5f6c702159ea7175bfb67179e3ca538a3d5c610d3aacc8b53e9959f5f61' 
  AND token = 'Pchd/q7L9JKvmL17DY088JVLXfnVBZS5S+BvAz9F80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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