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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a51458ac4a7e9a3ef1928734fed749fc6d5ced5cc3ae9a78fefd240a76c266' 
  AND token = 'X85p1DoRr2f/IaGMI/Weq7mHprbNnDSIrhNDEOGFVxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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