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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352ae636f13affc55681e3d75d02b431dd0b25b25861bdf2c35106e6e2554f84' 
  AND token = 'BxMAv8RgOLdohgGJ3nsMuZcqfbcX56OV3M07r34p57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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