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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809870b5538179734dfc3facc79ca2b94a8505f2f90f1d67dcc43464b659644c' 
  AND token = 'cocdyl82sp1qNngeWoge9qYI9Q7zpyz8XFPzbZ+kApk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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