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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e1167a55768c373d395b45e0262c97206e9bac25f298686bd699e61d6bbd0e' 
  AND token = '6VDysl44oUg0cQ3rrai/kTKHGTHyI7f9HaSlG2wmlns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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