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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa469e9458f22d1082367604433afa8665fdc96e1e444ffbcb3c7b142d472e7' 
  AND token = 'At1GhBO4u+A9LkIqBUldNM0Ms8a6J1kzyiopDJHHuW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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