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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c046937615a48ec7f006965b2ed17f2b2328b4d3f19dae9344fdff8861835fb' 
  AND token = 'SKeqIsQKsuEE5InzLExCaS/Vp/E2wfe0maJdIffB7f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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