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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561c8589bb7b7576da1788b6e7e2f48af099f29b8efde0d675411a82f239ed0e' 
  AND token = 'FZ/Eee0c3RbdX2FK3fVh/p7XnrOn/7Xe6xI2bkiSH2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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